Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ac6eca80e138d4…

MALICIOUS

PDF

41.0 KB Created: 2020-08-09 06:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6775399c92d4b0c5003689d335177ef2 SHA-1: 898a01a43011ad9328661b010550305a03f0cf78 SHA-256: c8ac6eca80e138d4de1dcbbd61bc06783b266010685bf448a168e7b01c4719d3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=history+of+early+childhood+education+in+zimbabwe+pdf'. This suggests the document is part of a link farm or SEO poisoning campaign designed to redirect users to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=history+of+early+childhood+education+in+zimbabwe+pdf In PDF document text
    • http://popesafi.georgiacirclek.org/uploads/1/3/2/6/132696323/fa2f6.pdfIn PDF document text
    • http://files.harrietslaughter.net/uploads/1/3/0/7/130739227/912d05cd84e5d0.pdfIn PDF document text
    • http://files.mackenzieleighmeyer.com/uploads/1/3/1/0/131070911/727be2.pdfIn PDF document text
    • http://gilat.avivapressman.com/uploads/1/3/1/4/131406717/sulogogudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/bd_singh_biotechnology_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/amino_acid_structure_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/zedawanirozorala.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/surah_rahman_alkalam._pk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66689816557.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/10156650787.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/27016686898.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7192/1573/files/balitedeviru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/bivuzotixalop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/all_nba_teams_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/ruvimuvaponamagumibekut.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6051 5740 bytes
SHA-256: b5525b9f9d81e5837de48cab3f165507d5576ff77f266c7cde0e453272280eb9
font_01_sfnt_off000073c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73C7 10272 bytes
SHA-256: c4c78637731b5cf4c722025a149b0efdd6397e98b323f370347358dbdb13cdf1

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